[material deleted] Time zones are not part of the problem yet POSIXt forces this extraneous complication on you. chron has no time zones in the first place and therefore allows you to work in the natural frame of the problem, avoiding subtle problems like this.
This sort of thing has been discussed a number of times and I had previously suggested that chron be moved to the base or else that a timezone-less version of POSIXt be added to the base. See: https://stat.ethz.ch/pipermail/r-devel/2003-August/027269.html
I also see the usefulness of a time-zone-free time/date class, but why does "chron" need to be moved to the base to be useful here?
-- Tony Plate
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